Installing CS6 Master Collection Student and Teacher Licensing

I am installing CS6 Master Collection Student and Teacher Licensing; I am in the middle of the process when I get a dialogue box asking for a second serial number for the Acrobat X Pro, I tried to add the initial serial number in order to start the install and it says it is not a valid serial for this product, what can I do?

This is suppose to be included in the suite right? why is it asking me for a second SN?